CN101535684B

CN101535684B - Vehicle transmission

Info

Publication number: CN101535684B
Application number: CN2007800382856A
Authority: CN
Inventors: 山口贤一
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2006-12-15
Filing date: 2007-12-14
Publication date: 2012-03-28
Anticipated expiration: 2027-12-14
Also published as: JP4670806B2; DE112007002398T5; CN101535684A; DE112007002398B4; US20100024591A1; US8495928B2; WO2008075168A2; JP2008151202A; WO2008075168A3

Abstract

A vehicle transmission (1) is provided that includes a casing (10) divided into a first portion (21) and a second portion (22) mutually communicated with each other; a gear (8), transversely mounted in the first portion (21) of the casing, that splashes up oil in the casing by rotation thereof and supplies the oil to a portion in the casing; and an air release passage (30) provided in the second portion (22) of the casing on an upstream side of oil flow generated by the rotation of the gear, that communicates with outside of the casing.

Description

Vehicle gear box

Technical field

The present invention relates to a kind of being installed in such as the gearbox on the vehicles such as automobile.Vehicle gear box generally includes automatic transmission case, manual transmission etc., such as the ransaxle on the vehicle that is installed in front-mounted engine front-wheel drive (FF) or be installed in gearbox on the vehicle of front-mounted engine rear wheel drive (FR) etc.

Background technique

When vehicle gear box moves, oil pump suction be present in the inner bottom part of housing machine oil and with the engine oil supplying of suction suitable part to gearbox.

In some cases, when vehicle gear box moved, the suitable rotation of the gear of machine oil through being arranged on enclosure interior was upwards splashed and is introduced in the suction side of oil pump, the part that especially need lubricate etc. from the inner bottom part of housing.

In this case because the rotation of the machine oil in the housing through gear is transferred or is sent to the downstream side, therefore can not be in the inner space of housing mean allocation machine oil.Especially, along with gear rotates quickly, the downstream side is carried or be sent to machine oil quickly through the rotation of gear, therefore increased the inequality distribution of machine oil and increased the temperature of machine oil and the interior pressure of housing.

Usually, in order to reduce the above-mentioned increase of pressing in the housing, be provided with at the upside of housing and release air into outside exhaust port (air release hole).

In order to limit or to prevent that machine oil from discharging from exhaust port, vent-plug is connected to exhaust port, or be provided with have the maze-like structure ventilation chamber with separated oil from air.(for example, seeing that publication number is the Japanese patent application of 2005-291263 and 10-205609)

Simultaneously, under the housing of vehicle gear box had through the situation that combines the segmenting structure that a plurality of parts form, the inner space of housing can be divided into a plurality of parts, yet these parts are interconnected.

In this case; When vehicle gear box is moving in company with the oil delivery operation through gear together; Phenomenon possibly produce: machine oil possibly accumulate in be positioned at the gear sense of rotation the downstream side (promptly; The downstream side of the oil stream that the rotation through gear produces) in the space, and air possibly accumulate in the space of upstream side (that is the upstream side of the oil stream that produces of the rotation through gear) of the sense of rotation that is positioned at gear.

Consider this phenomenon, exhaust port typically is arranged on a side that is in the space that machine oil possibly gather in the ceiling wall of housing.

In above-mentioned technology, when gear during with high-speed rotation, the oil delivery through gear accelerates.Therefore, in the space (that is, the space in the downstream side of gear sense of rotation) that machine oil possibly gather, machine oil increases or increases and form bubble.On the other hand, in the space (that is, the space of the upstream side of gear sense of rotation) that air possibly gather, interior pressure possibly increase.

In this case, because exhaust port is arranged on the top, space that machine oil possibly gather, therefore be difficult to come the interior pressure in the space that discharging air possibly gather through exhaust port.

For above-mentioned reasons, the interior pressure in the space that air possibly gather further increases, and impels machine oil or its bubble in the space that machine oil possibly gather further to increase.Therefore, under opposite extreme situations, machine oil possibly be leaked to the outside from vent-plug, and perhaps machine oil possibly leak into the outside through ventilation chamber and from exhaust port.

Summary of the invention

The invention provides a kind of vehicle gear box, the machine oil in its middle shell upwards splashes through the rotation that laterally is installed in the gear in the housing and is fed into part suitable in the housing.The interior pressure of housing was regulated when vehicle gear box had improved high-speed rotation significantly, and had prevented that machine oil from revealing from housing.

According to scheme of the present invention, a kind of vehicle gear box is provided, said vehicle gear box comprises: housing; Gear, it laterally is installed in the said housing, machine oil in the said housing is upwards splashed and said machine oil is supplied to a part in the said housing through its rotation; And the exhaust passage, it is arranged on the upstream side of the oil stream that the rotation that is in the said housing through said gear produces, and with the external communications of said housing.

Here, " gear is laterally installed " expression gear is provided so that the rotary middle spindle of gear flatly extends substantially.

For example, in said structure, when high-speed gear rotated, the downstream side through the oil stream of the rotation generation of gear carried or is sent to quickly by the machine oil in the housing by gear.Therefore, machine oil possibly form bubble, and the interior pressure at oil stream upstream side of housing possibly increase.

Yet, according to scheme of the present invention, in housing, be in the upstream side of the oil stream that the rotation through gear produces and wherein in press the local space that increases to pass through exhaust passage (airrelease passage) to be communicated with outside.Therefore, when the interior pressure of the upstream side of the oil that produces in the rotation through gear stream increased, interior the pressures quilt of increase was discharged into outside atmosphere immediately and safely.

In addition, in the zone of exhaust passage was set, because air possibly gather and machine oil is reduced or removes, so machine oil did not form bubble.Therefore, the inside end (opening end in the housing) of exhaust passage is not closed or blocked to oil bubbles.

As stated, because the interior pressure of housing is discharged into the outside safely through the exhaust passage, therefore prevented that the increase of interior pressure from causing that the machine oil in the housing is leaked to the outside through vent or vent-plug.

Enclosure interior can be divided into downstream side and upstream side and first portion that is interconnected and the second portion that lays respectively at oil stream.

In said structure, because gear upwards splashes machine oil, so machine oil possibly gather in the part in two parts, and air possibly gather in another part in two parts.

Exhaust portion can further be set at the position that is in the ceiling wall of housing corresponding to the downstream side of oil stream.

As stated, in said structure, interior pressures of the upstream side of the oil stream that the rotation through gear produces is by suitably adjusting.In addition, according to said structure, when high-speed rotation, the rising of machine oil or its bubble is reduced in the space in the oil stream downstream side that machine oil possibly gather.Further, the air of space upside that is present in the upstream side of the oil stream that the rotation through gear produces is released to the outside through exhaust portion.Therefore, prevented that machine oil or its bubble are leaked to the outside through vent or vent-plug.

The exhaust passage can be breathing pipe (breather pipe).One end of breathing pipe is arranged in the upstream side that housing is in oil stream, and the other end of breathing pipe is positioned at the outside of housing.

According to said structure,, therefore make structure and fitting operation oversimplify, and machine cost can be relatively low because breathing pipe is used as the exhaust passage.

Breathing pipe is vertical extent and penetrate the ceiling wall of housing substantially.

According to said structure, pressure can easily discharge naturally.In addition, though when gear when slowly running, machine oil also is not easy to be leaked to the outside.

Gear can comprise the gear ring that is contained in the differential mechanism in the housing.

In said structure, vehicle gear box is for being used in the vehicle gear box in front-mounted engine front-wheel drive (FF) vehicle, and the gear that therefore upwards splashes machine oil is special-purpose gear.

Therefore, the operation of vehicle gear box is stable and the durability of vehicle gear box is improved in long-time.

Description of drawings

The present invention above-mentioned with further purpose, feature and advantage through becoming clear to the description of example embodiment below in conjunction with accompanying drawing; Wherein identical reference character is used to represent components identical, and wherein: Fig. 1 illustrates the conduct profile diagram of structure under deployed condition of the ransaxle of vehicle gear box according to an embodiment of the invention; Fig. 2 is the exploded perspective view that the housing of ransaxle shown in Figure 1 is shown; Fig. 3 is the schematic representation from the observed ransaxle shown in Figure 1 of front end surface; Fig. 4 be illustrated in ransaxle outer cover shown in Figure 3 (transaxle housing) by under the situation about removing in driving axle housing the unequal schematic representation that distributes the state of machine oil; Fig. 5 is the stereogram of inner space that Fig. 3 and housing shown in Figure 4 schematically are shown; Fig. 6 is Fig. 3 to the stereogram of breathing pipe as the exhaust passage shown in Figure 5.

Embodiment

To combine accompanying drawing to describe embodiments of the invention below.Fig. 1 to Fig. 6 has shown embodiments of the invention.

In said embodiment, the ransaxle of front-mounted engine front-wheel drive (FF) vehicle is used as the instance of vehicle gear box and describes.

Fig. 1 illustrates the conduct profile diagram of structure under deployed condition of the ransaxle of vehicle gear box according to an embodiment of the invention.

Ransaxle 1 shown in Fig. 1 mainly comprises the torque-converters 2 that is contained in the single housing 10, (forward-reverse switching device) 3, gearshift 4 and differential mechanism 5 advance-reverse switching device.

For example, ransaxle 1 will via torque-converters 2 from the rotatory force (moment) of motor (not shown) input via advance-reverse switching device 3, gearshift 4 and differential mechanism 5 be sent to follower (not shown).

These parts that form ransaxle 1 are known basically parts.Therefore those parts will only briefly be described.

As when needing, advance-reverse switching device 3 switches between vehicle forward travel state and vehicle rollback state.Under vehicle forward travel state, export and sense of rotation does not change, and quilt is exported and rotation direction reversed under the vehicle rollback state via the rotatory force (moment) of the never illustrated motor of torque-converters 2 input.For example, advance-reverse switching device 3 can comprise double-pinion type planetary gear set 3A, forward clutch 3B and retreat break 3C.

In said embodiment, gearshift 4 is variable v-belt drive (CVT).In gearshift 4, belt 4C is wound on primary pulley 4A and the secondary pulley 4B.Gearshift 4 comes change speed through the roll diameter (effective diameter) that increases and reduce the belt 4C on primary pulley 4A, the secondary pulley 4B.

The rotatory force of the secondary pulley 4B of gearshift 4 is sent to differential mechanism 5 via reduction drive gear 6A, deceleration driven gear 6B, differential drive pinion 6C and main gear ring (final ring gear) 7.

Differential mechanism 5 is such as the double-pinion type differential mechanism, and when needing, distributes or separate power from main gear ring 7 inputs to be sent to left and right sides follower (not shown) via left and right sides live axle 8A, 8B.

Housing 10 holds the assembly of aforesaid ransaxle 1, is divided into four assemblies at said embodiment's middle shell 10.

More specifically; For example; The bonnet 13 of the opposite side that as shown in Figure 2, housing 10 comprises the driving axle housing 11, the ransaxle outer cover 12 that is connected to a side of driving axle housing 11 that are arranged on the center, be connected to driving axle housing 11 and the oil sump 15 that is connected to the bottom side of driving axle housing 11.

The middle partition wall of driving axle housing 11 (center partition wall) 11a has four cylinder shaft sleeve part 11b-11e.The shell 5a of axle S1, S2, S3 and differential mechanism 5 be inserted into

shaft sleeve part

11b, 11c, 11d and 11e respectively and by

shaft sleeve part

11b, 11c, 11d, 11e via the roller bearing rotatably support.The primary pulley 4A of gearshift 4 is set on the S1.Secondary pulley 4B and reduction drive gear 6A are set on the S2.Differential drive pinion 6C and deceleration driven gear 6B are set on the S3.

The machine oil of prearranging quatity is kept in the housing 10.The machine oil that is kept in the oil sump 14 for example is used as, and lubricant oil is with the rotating support portion or the slide part of the assembly of lubricated ransaxle 1, or as the hydraulic oil of torque-converters 2.The machine oil that is kept in the oil sump 14 also can be used as and the forward clutch 3B of gearshift 4 and the hydraulic pressure wet goods of the hydraulic actuator (not shown) of retreating joints such as break 3C or separating.

Along band ground, for example, the machine oil in the housing 10 is fed into the arbitrary portion that needs machine oil through oil pump.

To combine Fig. 3 to Fig. 6 that the structure according to embodiment's ransaxle 1 is described in further detail below.

Fig. 3 is the schematic representation that illustrates from the observed ransaxle shown in Figure 1 of front end surface.Fig. 4 is illustrated under the situation that ransaxle outer cover shown in Figure 3 is removed the schematic representation of the state of the unequal machine oil that distributes in driving axle housing.Fig. 5 is the stereogram of inner space that Fig. 3 and housing shown in Figure 4 schematically are shown.Fig. 6 is Fig. 3 to the stereogram of breathing pipe as the exhaust passage shown in Figure 5.

In said embodiment, housing 10 comprises two interior sections that separate 21,22.Two divided

portion

21,22 are interconnected via communication passage 23.In other words, the inside of housing 10 is divided into first portion 21 and second portion 22.

First portion 21 is set between the opposed facing driving axle housing 11 and ransaxle outer cover 12 of housing 10.Second portion 22 is set between opposed facing driving axle housing 11 and the bonnet 13.Communication passage 23 is the transverse holes of pre-position among the partition wall 11a in the middle of being arranged on.

Along band ground, first portion 21 all is communicated with oil sump 14 with second portion 22.Main gear ring 7 is set at a side of first portion 21.

For example, when ransaxle 1 was not moving, the machine oil in the housing 10 was equal to or greater than the specified level shown in the single-point line of Fig. 4.In other words, the oil level that is kept in the housing 10 is equal to or greater than limited amount.In this state, the bottom of main gear ring 7 is immersed in the machine oil.

Then, as stated, for example, the machine oil in the housing 10 is fed into the arbitrary portion that needs machine oil through oil pump 9.In this case; The rotation (along counter clockwise direction in Fig. 4) of the machine oil that arrives the position of predetermined altitude in the driving axle housing 11 when for example, vehicle is moving ahead through main gear ring 7 is shown in the solid line of Fig. 4 and upwards splash and be introduced in the suction side of oil pump 9 and the part that needs especially lubricate.

When ransaxle 1 was moving, because the oil delivery of the rotation through main gear ring 7 is operated, the oil level in two

parts

21,22 of housing 10 dissimilated.

Especially, when main gear ring 7 high-speed rotation, the oil delivery operation through main gear ring 7 becomes faster.Therefore; The downstream side that machine oil possibly accumulate in the sense of rotation that is positioned at main gear ring 7 (promptly; The downstream side of the oil stream that the rotation through main gear ring 7 produces) in the first portion 21; And air possibly accumulate in the second portion 22 of upstream side (that is the upstream side of the oil stream that produces of the rotation through main gear ring 7) of the sense of rotation that is positioned at main gear ring 7.

Therefore, at first, exhaust portion 25 is formed at the first portion 21 corresponding positions that are in the downstream side that the oil that produces with rotation through main gear ring 7 flows in the ceiling wall of driving axle housing 11 of housing 10.

In said embodiment, exhaust portion 25 is connected on it for the through hole in the ceiling wall that is formed on driving axle housing 11 and generally well-known vent-plug or filter.Selectively, generally well-known ventilation chamber with labyrinth shape and structure can be arranged near the through hole in the first portion 21 simply.

In addition, breathing pipe 30 is arranged in the second portion 22, as the exhaust passage with the external communications of housing 10.As shown in Figure 4, breathing pipe 30 is positioned at the upper reaches about the exhaust portion 25 of oily flow path direction.

Like Fig. 5 and shown in Figure 6, breathing pipe 30 is set on the cardinal principle Vertical direction, extend, that is, be positioned along the Vertical direction of housing 10.Breathing pipe 20 its longitudinally the neutral position bent twice to form S shape.Because breathing pipe 30 is crooked by like this, enter into breathing pipe 30 inside even therefore work as mist of oil, gas and machine oil still can easily be separated.

One end (lower end) of breathing pipe 30 is arranged in second portion 22, and is positioned in when ransaxle 1 is not moving the height away from machine oil surface preliminary dimension.

Further, the other end of breathing pipe 30 (upper end) be positioned as make breathing pipe 30 penetrate housing 10 driving axle housing 11 the ceiling wall and protrude to the outside.Although there is not to show in detail the outside opening end of breathing pipe 30, the outside opening end can stay open, and perhaps appropriate filters, well-known vent-plug etc. can be connected on it.

Further, oil hole 31 is set near the lower end of breathing pipe 30 and turns back to second portion 22 so that get into breathing pipe 30 inner machine oil.

The inner case of housing 10 when ransaxle 1 is moving will be described below.

At first, when ransaxle 1 was moving, machine oil was upwards splash and is transferred or be sent to the downstream side of its sense of rotation through the rotation of main gear ring 7.Therefore, machine oil possibly accumulate in the first portion 21 in the downstream side of the sense of rotation that is arranged in main gear ring 7, and air possibly accumulate in the second portion 22 of the upstream side of the sense of rotation that is arranged in main gear ring 7.

In this state, when main gear ring 7 high-speed rotation, the oil delivery operation through main gear ring 7 becomes faster.Therefore, in the first portion 21 that machine oil possibly gather, machine oil increases and forms bubble.On the other hand, the interior voltage rise of the air second portion 22 that possibly gather is high.

Yet according to said embodiment's structure, when above-mentioned situation took place, the air that is present in the upside of first portion 21 was accompanied by increasing from exhaust portion 25 of machine oil or its bubble and discharges.

On the other hand, although the interior voltage rise of second portion 22 is high, the interior outside that from breathing pipe 30, is released to housing 10 fast and safely of pressing.

In addition, because possibly gather and machine oil is reduced or removes in second portion 22 air, therefore the situation that machine oil forms bubble can not take place.Therefore, the lower end of breathing pipe is not closed by oil bubbles or is blocked.

As stated, the interior pressure that has prevented housing 10 too much raises and the interior pressure of housing 10 is suitably regulated through exhaust portion 25 and breathing pipe 30.Therefore, the rising that has prevented interior pressure causes that the machine oil in the housing 10 is leaked to the outside through vent or vent-plug.

Therefore, according to the abovementioned embodiments of the present invention, the operation of ransaxle 1 is stable and the durability of ransaxle 1 is improved.

Although described some embodiments of the present invention in the above; But it should be understood that; The present invention is not limited to described embodiment's details; But under the condition that does not break away from aim of the present invention and scope, various changes, the modification that can expect through those skilled in the art or improve and embody the present invention.

For example; Although in the above-described embodiments; The ransaxle 1 that is installed on the vehicle of front-mounted engine front-wheel drive (FF) is used as the instance of vehicle gear box, but also can use gearbox on the vehicle that is installed in front-mounted engine rear wheel drive (FR) as the instance of vehicle gear box.

Further, although in the above-described embodiments, variable v-belt drive is used to form the gearshift of ransaxle 1, also can use classification gearshift, planetary gears or annular transmission mechanisms.Selectively, can use manual transmission.

The breathing pipe of explaining in the foregoing description 30 as the exhaust passage can suitably be revised, as long as it has similar function.Further, depend on the circumstances, breathing pipe 30 can use other structures to replace.For example, the exhaust passage can be through forming in the inwall that is cast in housing 10.

Claims

1. a vehicle gear box (1) comprising:

Housing (10), it is divided into first portion (21) and the second portion (22) that is interconnected;

Gear (7), it laterally is installed in the said housing, machine oil in the said housing is upwards splashed and said machine oil is supplied to a part in the said housing through its rotation, and wherein said gear (7) is arranged in the said first portion (21); And

Exhaust passage (30), it is arranged in the said second portion (22) of said housing, and with the external communications of said housing.

2. vehicle gear box according to claim 1 wherein further is provided with exhaust portion (25) in the ceiling wall of the said first portion (21) of said housing.

3. vehicle gear box according to claim 1, wherein said exhaust passage comprises breathing pipe, an end of said breathing pipe is arranged in the said second portion (22) of said housing, and the other end is positioned at the outside of said housing.

4. vehicle gear box according to claim 3, wherein said breathing pipe vertically extend and penetrate the ceiling wall of said housing substantially.

5. according to each described vehicle gear box in the claim 1 to 4, wherein said gear comprises the gear ring that is contained in the differential mechanism in the said housing.

6. vehicle gear box according to claim 3; Wherein said breathing pipe comprises the oil hole near a said end of the said second portion of being arranged in of said breathing pipe (22), turns back to said housing so that get into the said machine oil of said breathing pipe through said oil hole (31).

7. vehicle gear box according to claim 3, wherein said breathing pipe its longitudinally the neutral position bent twice to form S shape.